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libssh2-vs-libssh.t
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libssh2-vs-libssh.t
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#include "doctype.t"
#include "setup.t"
HEAD(libssh2 vs libssh)
#include "body.t"
#include "menu.t"
<p>
TITLE(libssh2 vs libssh - A comparison)
BOXTOP
<p>libssh2 and libssh both provide an API to develop SSH based applications.
<p>Here's an attempt to put some light on the differences between them.
SUBTITLE(libssh2 1.11.0)
<p>
<ul>
<li>License: <a href="https://en.wikipedia.org/wiki/BSD_licenses#3-clause_license_.28.22Revised_BSD_License.22.2C_.22New_BSD_License.22.2C_or_.22Modified_BSD_License.22.29">3-clause BSD License</a>
<li>Developed in: C (37562 SLOC), sh (1193 SLOC), Perl (779 SLOC), Lisp (33 SLOC), AWK (23 SLOC)
<li>Number of functions: 184
<li>Key Exchange Methods: diffie-hellman-group-exchange-sha256, diffie-hellman-group1-sha1, diffie-hellman-group14-sha1, diffie-hellman-group-exchange-sha1
<li>Hostkey Types: ssh-ed25519, ssh-ed25519-cert-v01@openssh.com, ecdsa-sha2-nistp521, ecdsa-sha2-nistp384, ecdsa-sha2-nistp256, ssh-rsa, ssh-dss
<li>Ciphers: aes256-gcm@openssh.com, aes128-gcm@openssh.com, aes256-ctr, aes192-ctr, aes128-ctr, aes256-cbc (rijndael-cbc@lysator.liu.se), aes192-cbc, aes128-cbc, 3des-cbc, blowfish-cbc, cast128-cbc, arcfour, arcfour128
<li>Compression Schemes: zlib, zlib@openssh.com, none
<li>MAC hashes: hmac-sha2-512, hmac-sha2-512-etm@openssh.com, hmac-sha2-256, hmac-sha2-256-etm@openssh.com, hmac-sha1, hmac-sha1-96, hmac-md5, hmac-md5-96, hmac-ripemd160 (hmac-ripemd160@openssh.com)
<li>Authentication: none, password, public-key, hostbased, keyboard-interactive
<li>Channels: shell, exec (incl. SCP wrapper), direct-tcpip, subsystem
<li>Global Requests: tcpip-forward
<li>Channel Requests: x11, pty, exit-signal, keepalive@openssh.com
<li>Subsystems: sftp(version 3), publickey(version 2)
<li>SFTP: statvfs@openssh.com, fstatvfs@openssh.com
<li>Thread-safe: just do not share handles simultaneously
<li>Non-blocking: it can be used both blocking and non-blocking
<li>Your sockets: the app hands over the socket, calls select() etc.
<li>OpenSSL, Libgcrypt or WinCNG (native since Windows Vista): builds with either
</ul>
SUBTITLE(<a href="https://www.libssh.org/">libssh</a> 0.9.x)
<p>
<ul>
<li>License: <a href="https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html">GNU Lesser General Public License</a>
<li>Developed in: C (72888 SLOC), C++ (563 SLOC), sh (189 SLOC), Python (9 SLOC)
<li>Number of functions: 421
<li>Key Exchange Methods: curve25519-sha256, ecdh-sha2-nistp256, diffie-hellman-group18-sha512, diffie-hellman-group16-sha512, diffie-hellman-group-exchange-sha256, diffie-hellman-group14-sha1, diffie-hellman-group1-sha1, diffie-hellman-group-exchange-sha1
<li>Hostkey Types: ssh-ed25519, ecdsa-sha2-nistp256, ecdsa-sha2-nistp384, ecdsa-sha2-nistp521, rsa-sha2-512,rsa-sha2-256, ssh-rsa, ssh-dss
<li>Ciphers: chacha20-poly1305, aes256-gcm@openssh.com, aes128-gcm@openssh.com, aes256-ctr, aes192-ctr, aes128-ctr, aes256-cbc, aes192-cbc, aes128-cbc, 3des-cbc
<li>Compression Schemes: zlib, zlib@openssh.com, none
<li>MAC hashes: hmac-sha2-512-etm@openssh.com, hmac-sha2-256-etm@openssh.com, hmac-sha1-etm@openssh.com, hmac-sha2-512, hmac-sha2-256, hmac-sha1, none
<li>Authentication: none, password, public-key, keyboard-interactive, gssapi-with-mic
<li>Channels: shell, exec (incl. SCP wrapper), direct-tcpip, subsystem, auth-agent-req@openssh.com
<li>Global Requests: tcpip-forward, forwarded-tcpip
<li>Channel Requests: x11, pty, exit-status, signal, exit-signal, keepalive@openssh.com, auth-agent-req@openssh.com
<li>Subsystems: sftp(version 3), OpenSSH Extensions
<li>SFTP: statvfs@openssh.com, fstatvfs@openssh.com
<li>Thread-safe: Just don't share sessions
<li>Non-blocking: it can <b>not</b> be used entirely non-blocking.
<li>Your sockets: the app hands over the socket, or uses libssh sockets
<li>OpenSSL, mbedTLS or gcrypt
<li>Client and server support
<li>SSHv2 protocol support
<li>Supports Linux, UNIX, BSD, Solaris, OS/2 and Windows
<li>Automated test cases with nightly tests
<li>Event model based on poll(2), or a poll(2)-emulation.
<li>FIPS 140-2 compatibility
</ul>
SUBTITLE(Feature by feature)
<p>
The same data, in a table:
<table>
<thead>
<tr>
<th>item</th>
<th>libssh2</th>
<th>libssh</th>
</tr>
</thead>
<tbody>
<tr>
<td>Licence</td>
<td>BSD</td>
<td>LGPL</td>
</tr>
<tr>
<td>Server-side support</td>
<td>no</td>
<td>yes</td>
</tr>
<tr>
<td>GSSAPI authentication</td>
<td>no</td>
<td>yes</td>
</tr>
<tr>
<td>Elliptic Curve Key Exchange</td>
<td>yes</td>
<td>yes</td>
</tr>
<tr>
<td>Elliptic Curve Hostkeys</td>
<td>yes</td>
<td>yes</td>
</tr>
<tr>
<td>Certificate support</td>
<td>no</td>
<td>yes</td>
</tr>
<tr>
<td>FIPS 140-2 compliant</td>
<td>no</td>
<td>yes</td>
</tr>
<tr>
<td>Continuous Integration</td>
<td>Just compile tests</td>
<td>Fully featured testsuite including OpenSSH and dropbear client/server testing</td>
</tr>
<tr>
<td>Stable API</td>
<td>yes</td>
<td>mostly</td>
</tr>
<tr>
<td>C compatibility</td>
<td>C89</td>
<td>C99</td>
</tr>
<tr>
<td>strict namespace</td>
<td>yes</td>
<td>yes</td>
</tr>
<tr>
<td>man pages for all functions</td>
<td>yes</td>
<td>no</td>
</tr>
<tr>
<td>Doxygen documentation for all functions</td>
<td>no</td>
<td>yes</td>
</tr>
<tr>
<td>Tutorial</td>
<td>no</td>
<td>yes</td>
</tr>
<tr>
<td>Build concept</td>
<td>Autotools and CMake</td>
<td>CMake</td>
</tr>
</tbody>
</table>
BOXBOT
#include "footer.t"